Perspectives for Progress - A Framework to Evaluate Devices that Assess Physical Behavior.

A framework to develop and evaluate devices used to assess physical behavior will enable the field to move forward more cohesively and coherently. Body-worn devices that estimate physical behavior have tremendous potential to address key research gaps. However, there is no consensus on how devices and processing methods should be developed and evaluated, resulting in large differences in summary estimates and confusion for end users. We propose a phase-based framework for developing and evaluating devices that emphasizes robust validation studies in naturalistic conditions.